#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}

/* icon about */
.item {
  display: inline-block;
  box-sizing: border-box;
  width: 70px;
  height: 70px;
  background-color: yellow;
  padding: 15px;
  border-radius: 40%;
  cursor: pointer;
}
.item-wrapper {
  position: relative;
  overflow: hidden;
  width: 100%;
  height: 100%;
}
.item-wrapper img {
  width: 100%;
  height: 100%;
}

.item:hover .item-wrapper img {
  animation-duration: 0.8s;
  animation-name: slidein;
}

@keyframes slidein {
  0% {
    transform: translateX(0);
    animation-timing-function: ease-out;
  }
  40% {
    transform: translateX(50px);
  }
  41% {
    transform: translateX(-50px);
    animation-timing-function: ease-in;
  }
  80% {
    transform: translateX(0);
    animation-timing-function: ease-out;
  }
  90% {
    transform: translateX(-10px);
    animation-timing-function: ease-in;
  }
  100% {
    transform: translateX(0);
    animation-timing-function: ease-out;
  }
}
